> For the complete documentation index, see [llms.txt](https://docs.ionos.com/cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ionos.com/cloud/security-safeguards/vulnerability-register/2026/managed-kubernetes-vulnerability.md).

# Advisory on Managed Kubernetes Vulnerability

On July 16, 2026, <code class="expression">space.vars.ionos\_cloud</code> received a disclosure of a vulnerability affecting Managed Kubernetes worker nodes.

This vulnerability caused worker nodes running Managed Kubernetes v1.33+ to expose an internal administrative credential via the cloud-init provisioning mechanism. The credential remained readable on the node's filesystem after initial setup and could be accessed by any workload with the ability to mount the host filesystem. No CVE has been assigned to this vulnerability. It is classified as **Medium** severity with a CVSS score of **6.5**.

## Impacted IONOS CLOUD products

| **Product Ranges** | **Product**                                                                                    | **Impacted** | **Mitigated** | **Patch Status** |
| ------------------ | ---------------------------------------------------------------------------------------------- | ------------ | ------------- | ---------------- |
| Container          | [<mark style="color:blue;">Managed Kubernetes</mark>](/cloud/containers/managed-kubernetes.md) | Yes          | Yes           | Done             |

## Risk on IONOS CLOUD user environment

A user with permission to create a pod in a namespace without restricted security policies could mount the host filesystem and read an internal administrative credential left over from the node's initial setup. Access to this credential did not grant more rights than those already available to a legitimate cluster owner, but it could allow a workload to elevate its access within the cluster without appearing in standard audit logs.

## What action has IONOS CLOUD taken to mitigate the vulnerability?

<code class="expression">space.vars.ionos\_cloud</code> identified and resolved this issue as part of a scheduled internal component update delivered on August 27, 2026.

## What action can you take to mitigate the vulnerability?

The patch has been applied by <code class="expression">space.vars.ionos\_cloud</code> and no action is required to receive the fix.

## How can I get help?

If you have further questions or concerns about this vulnerability, contact [<mark style="color:blue;">IONOS CLOUD Support</mark>](https://docs.ionos.com/support/general-information/contact-information).


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